Water-heating attachment for stoves.



W. L. DAWBARN.

WATER HEATING ATTACHMENT FOR STOVES.

APPLICATION FILED MAY I, 1912.

Patented Jan. 8, 1918.

2 SHEETSSHEET I.

@w wG W. L. DAWBARN.

WATER HEATING ATTACHMENT FOR STOVES.

APPLICATION FILED HAY I, 1917.

Patented Jan. 8,1918,

2 SHEETSSHEET 2.

WARING L. DAWBARN, 0F HARTSDALE, NEW YORK.

WATER-HEATING ATTACHMENT FOR STOVES.

Application filed May 1, 1917.

To all whom it may concern:

Be it known that I, TVARING L. DAWBARN, a citizen of the United States, and resident of Hartsdale, county of WVestchester, and State of New York, have invented certain new and useful Improvements in VVater- Heating Attachments for Stoves, of which the following is a specification.

This invention relates to improvements in water-heating attachments or water-backs for stoves, and is especially adapted for use in connection with cooking stoves.

The principal object of the invention is to provide a water-back for stoves, so constructed and arranged that the water may be heated by a fire in the fire-box of the stove, or by an auxiliary source of heat, such as a gas-burner, when no fire is burning in the fire-box; or whereby the water-back may be heated from bothof said sources of heat simultaneously.

Another important object of the invention is to provide an improved form of waterback adapted to rapidly heat the water.

In the accompanying drawings, Figure 1 is a vertical transverse sectional View of a cooking stove, showing an embodiment of the invention;

Fig. 2 a vertical longitudinal sectional view of the water-back, taken on the line 11-11 of Fig. 3;

Fig. 3 a horizontal sectional view of the water-back, taken on the line I1IIII of Fig. 2;

Fig. 4 a side elevation of the stove; and

Fig. 5 a detail view taken on the line -VV of Fig. 1.

The stove comprises a body portion 1 of any suitable construction, having a fire-box 2 provided at its lower end with a grate 3, and a suitable ash-chamber 4. One side wall 5 of the stove casing 1 is formed, opposite the fire-box 2, with an outwardly ofi'set portion 6 terminating at its lower edge substantially in the plane of the grate, and opposite the ash-chamber 4 the wall 5 is formed with an inwardly offset portion 7 terminating at its upper edge substantially in alinement with the grate 3.

The fire-box 2 is provided with a lining of fire-resisting material 8, such as the ordinary fire-brick, around its inner walls except opposite the oifset portion 6 of the side wall 5 of the stove. At this point the inner wall of the fire-box is formed by the inner wall Specification of Letters Patent.

Patented J an. 8, 1918.

Serial No. 165,719.

of a water-back 9, held to the offset portion 6 of the casing by any suitable means. The fire-box lining 8 rests upon a plate 14 suitably held in the casing upon ledges or bars 15 and the upper edge of the offset side wall 7 of the ash chamber 4. The water-back is preferably supported by suitable brackets or lugs 10 held to the offset portion 6 of the casing, and by the outer edge of the plate 14, and its outer vertically corrugated wall 11 is held in spaced relation with said offset wall 6 by means of the water inlet and outlet connections or nipples l2 and 13, and any suitable supplemental fastening devices if desired.

The space between the lower edges of the offset portion 6 of wall 5 and the lower edge of the offset portion 7, is closed by a detachable angular plate or wall 16. The plate 16 is detachably held in place by lugs 17 formed thereon at its lower edge and adapted to engage in suitable apertures in the wall 5. The upper edge of the plate 16 engages against the offset lower edge 18 of the wall 6, and is held thereagainst by suitable latches l9 pivotally or otherwise held to the wall 6. Within the chamber formed by the walls 7 and 16 below the water-back 9, a suitable auxiliary heating device for the water-back is mounted. This auxiliary heater may be of any suitable construction, preferably comprising a suitable gas burner. As shown, an elongated horizontally arranged burner-tube 20, provided with gasdischarge orifices 21 along its upper edge, is held to the Wall 7 by suitable brackets 22. A gas and air mixing tube 23 is connected at one end with the burner tube 20 intermediate the ends of the burner tube, and at its other end is connected with the discharge end of a gas-supply pipe 24. The mixing tube 23 is formed with a suitable rotatably adjustable air inlet regulating plate or valve 25, and the gas-supply pipe 24 is provided with a suitable gas cook 26 for controlling the flow of gas. The gas-supply pipe 24 is preferably extended throughout the burner chamher, as shown, whereby the incoming gas is preheated before being discharged into the mixing tube 23. Air is admitted to the burner chamber to support combustion through a series of apertures 40 in the detachable plate or wall 16. To provide for convenient access to the burner for igniting the gas and regulating the burner, the wall 16 is formed with an opening 41 adapted to be closed by a sliding door 42, slidably held in ways 43 on the wall 16.

The water-back comprises a rectangular water chamber 9 having a vertically corrugated outer wall 11 and an inner wall forming one wall of the fire-box, said inner wall being formed with ribs or fins 27 to reinforce and protect the same. The fins 27 also serve to absorb and transmit heat to the water in the chamber 9, while the corrugations 11 increase the extent of the heat transmitting surface at the outer side of the chamber 9 and increase the area of the hot-air passage between the wall 11 and the wall 6. The water-back is formed with a series of vertically extending tubular air passages or flues 28 extending through the water chamber and arranged with their lower ends above the burner tube 20. The water inlet and outlet nipples 12 and 13 are suitably coupled or held to projecting or thickened portions 29 of the outer wall of the waterback, said portions 29 being formed with suitable water passages, as shown. The cold water inlet pipe 30 and the hot water outlet pipe 31 are connected with the nipples 12 and 18, respectively, by suitable couplings 32, and at their opposite ends are connected in the usual manner with the water supply system, or the stand-boiler of the wellknown household hot-water-supply system. The inner surface of the wall 6 is provided with a fire-resisting and heat-insulat ing lining 33 of asbestos, or other suitable material, to protect the wall and reduce the radiation of heat from the water-back. heat deflecting plate 3% is preferably mounted above the water-back and is held thereto by a pair of depending nipples 35 engaging in the upper ends of two of the flues v28.

- The deflector 3 lis held in spaced relation upon the top of the water-back, by dependinglongitudinal side flanges 36, and is formed with a longitudinal series of vapertures37 of smaller diameter than the flues 28 and preferably registering with said fiues. A deflecting plate 38 is held to the side wall 5 of the casing 1 above the waterback, and extends inwardly and clownwardly toward the upper end of the fire-box 2. At its lower edge the plate 38 is formed with a vertically depending portion or flange 39 extending downwardly along the inner side wall: of the water-back a suitable distance and spaced therefrom.

It will be obvious that the water-back may be heated from a fire in the fire-box 2 in the ordinary use of the stove for cooking purposes, or heated by means of the auxiliary gas-burner when there is no fire in the firebox. It'will also be seen that by the arrangement shown water may be rapidly or instantaneously heated either by the gasburner or by the gas-burner and a firein downwardly into the fire-box 2 by said deflector. The heated air and products of combustion passing through fiues 28 are deflected and caused to flow along the top of the water-back, by the plate 3 1, and pass upwardly through the restricted outlets 37, and are then directed inwardly and downwardly into the fire-box 2. The inwardly and downwardly directed heated air and products of combustion serve to supply heat to the inner wall of the water-back and also, when a fire is burning in the fire-box, tend to promote combustion in the fire-box. It will. thus be seen that the water-back may be quickly and intensely heated. The flues 28, corrugated wall 11, and ribbed wall 27, provide a maximum heat-transmitting surface and serve to greatly incr ase the rapidity with which the water flowing through the water-back may be heated.

What I claim is:

1. In a stove, the combination of a casing, a fire box, a water back supported in the casing and adapted to be heated from said fire box, a water supply conduit connected to the lower portion of said water back, a water outlet conduit connected to the upper portion of said water back, aseries of air fines extending upwardly through said water back, an auxiliary heating means sup ported beneath said water back, and an inverted channel-shaped deflector extending longitudinally of said water back and supported upon the top thereof over the upper ends of said fines, said deflector beingprovided with a series of apertures of smaller diameter than said fiues.

2.- In a stove, the combination'of a casing, a fire box, a water back mounted in the casing and forming a part of the wall of back being spaced from the casing to provide an air passage between thecasing and the water back, a series of air flues extending upwardly through said water back, an auxiliary heating means supported beneath said water b ack,-and means for deflecting vvthe fire box, thcuouter wall of said water.

, the fire box, the outer wall of said water 1 and flues downwardly into the fire box along the inner Wall of the water back.

4. In a stove, the combination of a casing, a fire box, a water back mounted in the casing and forming a part of the wall of the fire box, a series of air flues extending upwardly through said water back, an auxiliary heating means supported beneath said water back, and an inverted channelshaped deflector seated on the top wall of the water back over the upper ends of said flues, said deflector being formed with aseries of apertures of less diameter than said flues and having a plurality of depending tubular lugs adapted to engage in the upper ends of certain of said flues.

5. In a stove, the combination of a casing, a fire box, a Water back mounted in the casing and forming a part of the wall of the fire box, the outer wall of said water back being spaced from the casing to provide an air passage, a series of air flues extending upwardly through said water back, an auxiliary heating means supported beneath said water back, an inverted channelshaped deflector held upon the top wall of the Water back and formed with a series of apertures of less diameter than said flues,

'and means supported above the water back for directing the air rising through said passage and the apertures in the deflector downwardly into the fire box adjacent the inner wall of the water back.

6. In a stove, the combination of a casing, a fire box, a water back mounted in the casing and forming a part of the wall of the fire box, the outer wall of said water back bein vertically corrugated and spaced from the casing to provide an air passage and the inner wall of the water back being provided with vertically extending ribs, a series of air flues extending upwardly through said Water back, an auxiliary heating means supported beneath said Water back, and means for deflecting air rising through said passage and flues downwardly into the fire box along the inner wall of the water back. Y

7. In a stove, the combination of a fire box, a water-back forming part of the wall of the fire box, an auxiliary heater, and means for directing heated air from said auxiliary heater along the outer side of said water-back and into the fire box along the inner Wall of the Water-back.

8. In a stove, the combination of a fire box, a water-back forming part of the wall of the fire box, an auxiliary heater supported beneath the bottom of the water back, and means for directing air heated by said auxiliary heater upwardly along the outer side of the water-back, over the top of the water-back, and downwardly into the fire box along the inner side of the water-back.

In testimony whereof I hereunto afiix my signature.

WARING L. DAWBARN.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents,

Washington, D. C. 

